Stelara IV (intravenous) is a prescription medication used in the treatment of several chronic inflammatory conditions, including moderate to severe plaque psoriasis, active psoriatic arthritis, Crohn's disease, and ulcerative colitis. The active ingredient in Stelara is ustekinumab, which is a biologic medication that works by targeting specific proteins in the body's immune system that play a key role in the inflammation process. By doing so, Stelara helps to reduce the signs and symptoms of the conditions it is used to treat, leading to an improvement in the patient's quality of life. It is administered directly into the bloodstream through an intravenous infusion under the guidance of a healthcare professional. As with any medication, it is important to use Stelara under the supervision of a doctor, who can provide guidance on its suitability and potential side effects for individual patients.